"What's he like?" And where has Peter heard that name before? Recently, he means. It feels familiar.

"He's a loner, a bookworm, a perfectionist, an overachiever, a genius, and romantically reserved."

...that's a really fucking weird list, he's gotta say. But still, taking it at face value, "He sounds like an interesting person. And, 'romantically reserved', but he's fine with you, uh, having relationships with other people?" Why did Peter use the word "relationships" when he meant "sex".

"Yes! We're polyamorous."

"Huh. Cool. Well, I'm looking forward to meeting him tomorrow."

"I think you'll like him!"

...Peter might've dismissed that as rose-tinted glasses and Zach being in love and being certain that everyone would like the person he likes, especially given that he and Peter barely exchanged five words, but there's something about the way Zach says it...

"Oh? Why?"

"You're a genius, a lovebug, active, and good, and I think you'd get along well."

"wha"

"He's not much of a people person though so you might want to spend time with him one-on-one rather than in a party or whatever."

"That was a very... interesting... description of me you had, there."

"I'm very observant!"